/*$OpenBSD: _wcstol.h,v 1.1 2005/07/01 08:59:27 espie Exp $    */
/* $NetBSD: _wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp $ */

/*-
 * Copyright (c) 1990, 1993
 *The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Original version ID:
 * @(#)strtol.c    8.1 (Berkeley) 6/4/93
 * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
 */

/*
 * function template for wcstol, wcstoll and wcstoimax.
 *
 * parameters:
 *FUNCNAME : function name
 *      int_type : return type
 *      MIN_VALUE : lower limit of the return type
 *      MAX_VALUE : upper limit of the return type
 */

int_type
FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
{
    const wchar_t *s;
    int_type acc, cutoff;
    wint_t wc;
    int i;
    int neg, any, cutlim;

    /* check base value */
    if (base && (base < 2 || base > 36)) {
        errno = EINVAL;
        return 0;
    }

    /*
     * Skip white space and pick up leading +/- sign if any.
     * If base is 0, allow 0x for hex and 0 for octal, else
     * assume decimal; if base is already 16, allow 0x.
     */
    s = nptr;
    do {
        wc = (wchar_t) *s++;
    } while (iswspace(wc));
    if (wc == L'-') {
        neg = 1;
        wc = *s++;
    } else {
        neg = 0;
        if (wc == L'+')
            wc = *s++;
    }
    if ((base == 0 || base == 16) &&
        wc == L'0' && (*s == L'x' || *s == L'X')) {
        wc = s[1];
        s += 2;
        base = 16;
    }
    if (base == 0)
        base = wc == L'0' ? 8 : 10;

    /*
     * See strtol for comments as to the logic used.
     */
    cutoff = neg ? MIN_VALUE : MAX_VALUE;
    cutlim = (int)(cutoff % base);
    cutoff /= base;
    if (neg) {
        if (cutlim > 0) {
            cutlim -= base;
            cutoff += 1;
        }
        cutlim = -cutlim;
    }
    for (acc = 0, any = 0;; wc = (wchar_t) *s++) {/*lint !e443*/
        i = wctoint(wc);
        if (i == -1)
            break;
        if (i >= base)
            break;
        if (any < 0)
            continue;
        if (neg) {
            if (acc < cutoff || (acc == cutoff && i > cutlim)) {
                any = -1;
                acc = MIN_VALUE;
                errno = ERANGE;
            } else {
                any = 1;
                acc *= base;
                acc -= i;
            }
        } else {
            if (acc > cutoff || (acc == cutoff && i > cutlim)) {
                any = -1;
                acc = MAX_VALUE;
                errno = ERANGE;
            } else {
                any = 1;
                acc *= base;
                acc += i;
            }
        }
    }
    if (endptr != 0)
        /* LINTED interface specification */
        *endptr = (wchar_t *)(any ? s - 1 : nptr);
    return (acc);
}
